Enable ipywidgets

[jenshnielsen]

Some users have been playing with ipywidgets in the notebook. Currently the installer does install them because it depends on the jupyter meta package but it does not activate the Javascript. Consider adding

jupyter nbextension enable --py --sys-prefix widgetsnbextension

to the installer?

[WilliamHPNielsen]

Is there any good reason not to do it? If sliders make people happy, should they not be there?

[jenshnielsen]

Not really I think it's fine to install